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O'Danielite

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Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia
© Brent Thorne

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Formula:
Na(Zn,Mg)
 
3
H
 
2
(AsO
 
4
)
 
3
System:MonoclinicColour:Pale violet
Hardness:4
Member of:Alluaudite Group
Name:Named in 1980 by Keller and Hess in honor of Herbert O'Daniel [1903-1977], professor of mineralogy, Universitat Munich, Germany.


Alluaudite Group.

Classification of O'Danielite

IMA status:Approved
Dana 7th edition ID:38.2.7.1
Hey's CIM Ref.:20.3.13

20 : Arsenates (also arsenates with phosphate, but without other anions)
3 : Arsenates of Zn, Cd or Hg
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Type Occurrence of O'Danielite

Type Locality:Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia
Geological Setting of type material:Oxidized zone of zinc-rich polymetallic ore body.
Associated Minerals at type locality:
AdamiteProsperiteKoritnigite

Physical Properties of O'Danielite

Lustre:Sub-Vitreous
Diaphaneity (Transparency):Translucent
Colour:Pale violet
Hardness (Mohs):4
Hardness Data:Estimated
Tenacity:Brittle
Cleavage:Perfect
{010}, {100} perfect; {001} good?
Fracture:Irregular/Uneven
Density (measured):4.24 g/cm3
Density (calculated):4.49 g/cm3

Crystallography of O'Danielite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/b {B1 1 2/b} {C2/c} {C1 2/c 1}
Space Group Setting:C2/c
Cell Parameters:a = 12.113Å, b = 12.445Å, c = 6.793Å
β = 112.87°
Ratio:a:b:c = 0.973 : 1 : 0.546
Unit Cell Volume:V 943.52 ų (Calculated from Unit Cell)
Z:4
Comment:Neues Jahrbuch MM 395 (1988) structure.
X-Ray Powder Diffraction:
d-spacingIntensity
6.22 (100)
5.59 (50)
3.56 (70)
3.26 (100)
2.78 (80)
2.72 (80)
1.687 (70)
1.664 (60)
Comments:ICDD 35-482

Optical Data of O'Danielite

Type:Biaxial (+)
RI values: nα = 1.745 nβ = 1.753 nγ = 1.778
2V:Measured: 60° , Calculated: 60°
Birefringence:0.033
Maximum Birefringence:δ = 0.033

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:r > v moderate
Optical Extinction:X=b; Y ^ c = 18°
Pleochroism:Non-pleochroic

Chemical Properties of O'Danielite

Formula:
Na(Zn,Mg)
 
3
H
 
2
(AsO
 
4
)
 
3
Essential elements:As, H, Na, O, Zn
All elements listed in formula:As, H, Mg, Na, O, Zn

Relationship of O'Danielite to other Species

Member of:Alluaudite Group
Other Members of Group:

- +
Alluaudite
(Na,Ca)Mn
2+
 
(Fe
3+
 
,Mn
2+
 
,Fe
2+
 
,Mg)
 
2
(PO
 
4
)
 
3
Alluaudite-Ca□
□
 
4
Ca
 
4
Mn
2+
4
Fe
3+
8
(PO
 
4
)
 
12
Alluaudite-Na□
□
 
4
Na
 
4
Mn
2+
4
Fe
3+
8
(PO
 
4
)
 
12
Arseniopleite
NaCaMn
2+
 
(Mn
2+
 
,Mg)
 
2
(AsO
 
4
)
 
3
Bradaczekite
NaCu
 
4
(AsO
 
4
)
 
3
Caryinite
(Na,Pb)(Ca,Na)(Ca,Mn
2+
 
)(Mn
2+
 
,Mg,Fe
3+
 
)
 
2
(AsO
 
4
)
 
3
Ferroalluaudite
(Na,Ca)Fe
2+
 
(Fe
3+
 
,Mn
2+
 
,Fe
2+
 
)
 
2
(PO
 
4
)
 
3
Ferroalluaudite-NaNa
Na
 
4
Na
 
4
Fe
2+
4
Fe
3+
8
(PO
 
4
)
 
12
Ferrohagendorfite
NaCaFe
2+
 
Fe
2+
2
(PO
 
4
)
 
3
Groatite
NaCaMn
 
2
(PO
 
4
)(HPO
 
4
)
 
2
Hagendorfite
NaCaMn
2+
 
Fe
2+
2
(PO
 
4
)
 
3
Hagendorfite-Varulite Series
NaCaMn
2+
 
(Fe
2+
 
,Fe
3+
 
,Mg)
 
2
(PO
 
4
)
 
3
Hatertite
Na
 
2
(Ca,Na)(Fe
3+
 
,Cu)
 
2
(AsO
 
4
)
 
3
Johillerite
Na(Mg,Zn)
 
3
Cu(AsO
 
4
)
 
3
Maghagendorfite
NaMn(Mg,Fe,Fe)
 
3
(PO
 
4
)
 
3
Nickenichite
Na
 
0.8
Ca
 
0.4
Cu
 
0.4
(Mg,Fe)
 
3
(AsO
 
4
)
 
3
Varulite
NaCaMn
2+
 
Mn
2+
2
(PO
 
4
)
 
3
Yazganite
NaFe
3+
2
(Mg,Mn
2+
 
)(AsO
 
4
)
 
3
 · H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
20.3.1Adamite
Zn
 
2
(AsO
 
4
)(OH)
20.3.2Paradamite
Zn
 
2
(AsO
 
4
)(OH)
20.3.3Koritnigite
Zn(HAsO
 
4
) · H
 
2
O
20.3.4Legrandite
Zn
 
2
(AsO
 
4
)(OH) · H
 
2
O
20.3.5Warikahnite
Zn
 
3
(AsO
 
4
)
 
2
 · 2H
 
2
O
20.3.6Köttigite
Zn
 
3
(AsO
 
4
)
 
2
 · 8H
 
2
O
20.3.7Stranskiite
Zn
 
2
Cu(AsO
 
4
)
 
2
20.3.8Philipsburgite
(Cu,Zn)
 
6
(AsO
 
4
,PO
 
4
)
 
2
(OH)
 
6
 · H
 
2
O
20.3.9Austinite
CaZn(AsO
 
4
)(OH)
20.3.10Prosperite
CaZn
 
2
(AsO
 
4
)(HAsO
 
4
)(OH)
20.3.11Gaitite
Ca
 
2
Zn(AsO
 
4
)
 
2
 · 2H
 
2
O
20.3.12Zincroselite
Ca
 
2
Zn(AsO
 
4
)
 
2
 · 2H
 
2
O
20.3.14Johillerite
Na(Mg,Zn)
 
3
Cu(AsO
 
4
)
 
3
20.3.15Holdenite
(Mn
2+
 
,Mg)
 
6
Zn
 
3
(AsO
 
4
)
 
2
(SiO
 
4
)(OH)
 
8
20.3.16Chudobaite
(Mg,Zn)
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 10H
 
2
O
20.3.17Chlorophoenicite
(Mn,Mg)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
20.3.18Lotharmeyerite
Ca(Zn,Mn
3+
 
)
 
2
(AsO
 
4
)
 
2
 · 2(H
 
2
O,OH)
20.3.19Metaköttigite
(Zn,Fe,Fe)
 
3
(AsO
 
4
)
 
2
 · 8(H
 
2
O,OH)
20.3.20Ojuelaite
ZnFe
3+
2
(AsO
 
4
)
 
2
(OH)
 
2
 · 4H
 
2
O
20.3.21Fahleite
Zn
 
5
CaFe
 
2
(AsO
 
4
)
 
6
 · 14H
 
2
O
20.3.22Keyite
Cu
2+
3
Zn
 
4
Cd
 
2
(AsO
 
4
)
 
6
 · 2H
 
2
O
Related Minerals - Dana Grouping):

- +
38.2.7.2Johillerite
Na(Mg,Zn)
 
3
Cu(AsO
 
4
)
 
3
38.2.7.3Nickenichite
Na
 
0.8
Ca
 
0.4
Cu
 
0.4
(Mg,Fe)
 
3
(AsO
 
4
)
 
3
38.2.7.5Yazganite
NaFe
3+
2
(Mg,Mn
2+
 
)(AsO
 
4
)
 
3
 · H
 
2
O

Other Names for O'Danielite

Synonyms:
IMA1979-040
Other Languages:
German:O'Danielit
Russian:Оданиелит
Spanish:O'Danielita

Other Information

Fluorescence in UV light:Not fluorescent.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for O'Danielite

Reference List:

- +
American Mineralogist (1981): 66: 218-219, 1276.

Keller P. and Hess, H. (1988): Die Kristallstrukturen von O'Danielit, Na(Zn,Mg)3H2(AsO4)3 und Johillerit, Na(Mg,Zn)3Cu(AsO4)3. Neues Jahrbuch fuer Mineralogie Monatshefte 1988, 395-404. (in German)

Internet Links for O'Danielite

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    • Localities for O'Danielite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Namibia
     
    • Otjikoto (Oshikoto) Region
      • Tsumeb
    		[Neues Jahrb.Min.,Mh.(1981) 155-160; Clark, 1993 - "Hey's Mineral Index"]
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